Ecology
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Biosphere and Biome
Ecosystems, Communities and Populations
Species, Habitat and Niche
Abiotic Factors
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For water
Biotic Factors
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For water
Food Webs
Food Chains
Food Pyramids
Abiotic and Biotic Factors video
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Food Web
Food Webs are a network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem.